it generally forms part of the verb phrase in a sentence – e.g. “He Should have killed the sheep.” it tells us an awful lot about what the author thinks about what he’s writing about
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Card 17
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the main meaning part of the verb phrase – which would be “killed” in the verb phrase “should have killed”
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Card 18
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the helping verb – the little one which helps form the precise tense – such as “have” “was” or “did”
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Card 19
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the verb is which connects the sentence’s subject to the predicative adjective or its complement – as in “Mary is sweet.”